Medium Live

5x5 Crypto

60 points

1591 Solves

Cryptography

Medium

skywalkrs

Community Rating: 4.13 / 5

Ever heard of the 5x5 secret message system? If not, basically it's a 5x5 grid with all letters of the alphabet in order, without k because c is represented to make the k sound only. Google it if you need to. A letter is identified by Row-Column. All values are in caps. Try: 1-3,4-4,2-1,{,4-4,2-3,4-5,3-2,1-2,4-3,_,4-5,3-5,}

First 10 Solvers

Rank Username
1 pranavpatil
2 pentahex
3 entropy
4 yenyi
5 landofleet
Rank Username
6 vidar
7 pkhrag
8 diana
9 potatodrug
10 orikson

  • TimNDF

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  • srajith

    hi what is the format of flag submission is it CTFlearn{xxx} ??

    • intelagent moderator badge ctflearn++ badge

      Most challenges you will find in the CTFlearn{} format. However, when matching flags we only check what's between the brackets, so it actually doesn't matter the flag format, just what's inside the brackets.

      • srajith

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        • intelagent moderator badge ctflearn++ badge

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        • Lakshay

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  • sebhz

    Should probably be rated as easy. But fun.

  • Jay_jayjay1

    The system is actually called the polybius square.

  • cdblish3

    entering CTF{XXXXXXXX} Does not seem to work...

  • cdblish3

    Sometimes you have to read the small print...

  • pizzamonkey00

    This should probably be downgraded to easy. I mean, it'd be one thing if it was just the cipher but you literally tell people how to solve it.

  • Papang

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  • Papang

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  • sampath38

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    • sampath38

      Got it...i forgot to put the underscore..

  • Panics

    WTF CTF{XXXX_XX} contain '_' i cant see that :V